3d printable parts to increase size of mouse

I have extremely large hands, 19 cm length and 12 cm width. I use razer da, simply because it has better shape than other mice. But i have no control, i lose grip while playing and i have to seize mouse to hard, which is uncomfortable and i am warping my wrist and fingers... I saw somewhere that, you can 3d print parts to increase mouse size.But don't remember where. But i don't know how to design that. Also don't know how it holds on the mouse. Is there some community, or forums, which do this. I would like to increase width and length of my mouse.